Since the start of the One Year War, the Zaku II the F-Type was the most heavily mass-produced version of the Zaku II line and has been the backbone of Zeon's mobile suit forces. It is the F-type Zaku II that is also the most well-known version of Zeon's mobile suit forces. The F type, which accounts for more than half the total production run of the Zaku II, is the archetypal Zaku. Though it can be used on Earth, the F type's primary function is space combat, and most of Zeon's terrestrial forces are equipped with the J type Zaku II instead (a minor distinction, since the F and J types are externally identical). Upon receiving this new model, many of the Zeon mobile suit pilots who distinguished themselves during the early days of the war adopted their own distinctive personal colors.